Added app loaders and screen for the ui. Added identity service. Started auth screens

Moonlight.Client/Implementations/AuthenticationUiHandler.cs

@@ -0,0 +1,27 @@
+using Microsoft.AspNetCore.Components;
+using MoonCore.Blazor.Helpers;
+using Moonlight.Client.Interfaces;
+using Moonlight.Client.Services;
+using Moonlight.Client.UI.Screens;
+
+namespace Moonlight.Client.Implementations;
+
+public class AuthenticationUiHandler : IAppLoader, IAppScreen
+{
+    public int Priority => 0;
+
+    public Task<bool> ShouldRender(IServiceProvider serviceProvider)
+    {
+        var identityService = serviceProvider.GetRequiredService<IdentityService>();
+        
+        return Task.FromResult(identityService.IsLoggedIn);
+    }
+
+    public RenderFragment Render() => ComponentHelper.FromType<AuthenticationScreen>();
+
+    public async Task Load(IServiceProvider serviceProvider)
+    {
+        var identityService = serviceProvider.GetRequiredService<IdentityService>();
+        await identityService.Check();
+    }
+}